Over the weekend, Washingtonians retreated to Pimlico for the 138th Preakness Races, Bethesda hosted a fashion show with Jessica Alba, The Kennedy Center simulcasted Show Boat to picnickers at Nats Park, Georgetown University threw their Senior Ball and more:

Insomniac returned to the Big Apple this weekend for the 2nd annual Electric Daisy Carnival in New York. Held at Citi Field for the first time, approximately 90,000 fans gathered on Friday and Saturday, to enjoy DJ performances, theatrical acts, art installations, carnival rides, and firework displays. With five stages and state-of-the-art sound and lighting production, DJs including Calvin Harris, Afrojack, Porter Robinson, Eric Prydz, La Roux, and ATB took over the Citi Field parking lot. For those of you who missed out on the adventure (or need a quick reminder), check out our Instagram round up of the 2013 EDC. More»

We hope you’ve been resting up since Coachella, because Electric Daisy Carnival is just around the corner. With EDC hitting New York's Citi Field this Friday and Saturday, you’ve still got a little time left to plan the perfect look for the all-day, outdoor festivity. This is one festival where you can have a lot of fun with your look (think less fringe and cutoffs, more neon and tutus). Click through to find out what to wear to stand out and stay comfortable all weekend long. More»

Diane Keaton and John C. Reilly fete photographer Matthew Rolston's new book; Vera Farmiga and her "Bates Motel" costars spend an evening with The Paley Center; Halle Berry, Andy Garcia, and Julie Bowen help lead the way at the EIF Revlon Run/Walk for Women; Demi Lovato, Adam Levine, Britney Spears and dozens of other pop stars hit KIIS FM's Wango Tango; Tyler Perry, Angela Bassett and Lisa Vanderpump waltz through the CARRY Foundation's annual "Shall We Dance" Gala; John Legend joins Stevie Wonder for his 63rd birthday celebration—get caught up on the weekend's top happenings in this edition of Last Night's Parties.

The heat will be on in Miami this weekend and the music will be pumping for the 15th anniversary of the Ultra Music Festival. Featuring the biggest names in electronic dance music, for the first time, the festival will be held over 2 weekends, marking the beginning and end of Miami Music Week. Hurry and get your swimsuit and glow sticks, as tickets for the outdoor electronic festival are selling out fast. Click through for our guide to the must-see DJ sets and live acts at Ultra this year. More»

Valentine's Day may be meant for mushy lovey-dovey couples doing candlelit dinners at the overpriced French restaurant with bad service but there's absolutely no reason it has to be. Whether you're riding solo or you and your someone special would prefer to skip the traditional Valentine's scene, there are loads of parties and events happening on this unholiest of Hallmark holidays to suit your anti-Cupid needs. From art shows and wild nightclub beats courtesy of world-renowned DJs to masked Mexican wrestling lucha libre matches, see all L.A. has to offer to make today fun for everyone in our Valentine's Day party guide!

Rihanna, Big Boi and Ne-Yo step out for the Island Def Jam Grammy after party; Akon, Kelly Rowland, Gotye, Afrojack, Brandon Boyd and more celebrate with Republic Records; Swizz Beatz, Alicia Keys, John Legend, Rick Ross and more make it out for House of Hype Monster's Grammy after party; Neil Patrick Harris and Bonnie McKee party with Billboard on the roof of The London; Alessandra Ambrosio, Ashley Benson, Sting and others celebrate with Warner Music Group at Chateau Marmont; Red Light Management takes over Skybar for a post Grammy soiree with Natasha Bedingfield among others— get the lowdown on who was out celebrating at L.A.'s top post-Grammy events in this edition of Last Night's Parties!

Justin Timberlake, Jessica Biel, Timbaland and Amy Adams attend Darren Le Gallo's art opening; Flo Rida and Kendra Wilkinson debate on who wore it better at OK! Magazine's pre-Grammy party; John Legend and Christina Milian hang with the Mayor at a music industry reception; L.A. Reid, Jeffery Katzenberg and Ciara party at Beacher's Madhouse with Epic Records; Gary Oldman, Harrison Ford and Billy Bob Thornton celebrate the opening of the Morrison Hotel Gallery by forming the ultimate boy band—okay, so they didn't form a boy band, but it's fun to pretend while getting the rundown on Thursday's top events in this installment of Last Night's Parties.

If there's one thing New Yorkers know how to do, it's ringing in the New Year the right way, and 2013 was no exception. From an amazing Armin Van Buuren DJ set at Pier 36 to a little Gangnam Style in Times Square, there were no shortage of NYE celebrations in NYC on Monday night. When it comes to partying, no city does it quite like New York. Just click through to see all the photographic evidence.

[Jay Z, Chris Martin] [Theodora Richards, Alexandra Richards]

On Monday night Jay-Z and Coldplay counted down the last few seconds of 2013 together at Barclays Center, Harley Viera Newton and Alexandra Richards danced until the early hours at Soho Grand Hotel's annual Black and White masquerade ball, Tiesto rang in the new year at Revel in Atlantic City, Taylor Swift and Psy took over Times Square for the NYE Waterford Crystal ball drop, and so much more! Check out how New Yorkers celebrated with our New Year's Eve 2013 party round up.